Down South Dave

I looked underneath and I think I see it underneath this shield by the engine mount is this it? - I’m wondering if that harness/wire is supposed to be so taught? The only video I could find on youtube was a guy showing the location of both the driver’s and passenger’s on the 14-18 Tahoe.

Hi, I’ve been getting an intermittent p0325 code for knock sensor bank 1. Symptoms are a CEL and rough acceleration/driving at slow speeds when code is active. Bought the OEM sensor to replace but cannot find any documentation on the 14-18 year Silverado on where exactly it is, and how to swap it. Two main questions - a) how do I swap the sensor itself? b) if it is the harness/wiring that plugs into (I read in here that the wiring connects near the vacuum pump which I just had replaced from dealer warranty recently) where exactly is it and how do I test either one of these to know which one is faulty?